Java Master 2002 Coffee Roaster: Difference between revisions

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In general, coffee sugars are made accessible by roasting, but the caramelization process also reduces perceptual sweetness over roast time at a similar degree of roast. Additionally caffeine content lowers over time with off-gassing from longer roasts. Acidity also tends to lessen over time past City+ and into Full City/Second Crack, until carbonic acidity eventually raises in the darkest roasts. Roasters aim for a consistent rate of rise over time, just as with making caramel, so that the caramelization process does not stop and start haltingly, which will reduce perceptual sweetness as well and lead to uneven bean development.
In general, coffee sugars are made accessible by roasting, but the caramelization process also reduces perceptual sweetness over roast time at a similar degree of roast. Additionally caffeine content lowers over time with off-gassing from longer roasts. Acidity also tends to lessen over time past City+ and into Full City/Second Crack, until carbonic acidity eventually raises in the darkest roasts. Roasters aim for a consistent rate of rise over time, just as with making caramel, so that the caramelization process does not stop and start haltingly, which will reduce perceptual sweetness as well and lead to uneven bean development.


'''Roasting on the Java Master'''
'''Roasting on the Java Master'''
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== Operation Checklist ==
== Operation Checklist ==


* Get stuff ready:
** Get hopper, funnel, bags from Kitchen
** Weigh beans (Kitchen has a scale)
* Turn Power on
* Turn Power on
* Turn Heat on
* Check (and, if necessary, empty) chaff collector
* Check (and, if necessary, empty) chaff collector
* Turn on exhaust fan (switch on wall to the right of the machine)
* Turn on exhaust fan (switch on wall to the right of the machine)
* Set air and bean temperatures
* Set air and bean temperatures (530 and 400 are good starter numbers)
* Put hopper in place over the blower vents  
* Put hopper in place over the blower vents  
* Pour in beans
* Pour in beans
* Make certain the top cap is in place
* Make certain the top cap is in place
* Turn Heat on
* Press the Run button
* Press the Run button
* Hot air heats up beans, eventually beans reach set Bean temperature
* Hot air heats up beans, eventually beans reach set Bean temperature
* Machine turns off heat, cooling water starts, machine continues to blow air to cool down beans
* Machine turns off heat, cooling water starts, machine continues to blow air to cool down beans
* Wait for bean temp to drop below 370 F, at which point yellow Reset lamp lights
* Wait for the machine to stop blowing air.
* The operator can dump the beans now, or continue to cool the beans in the chamber. To dump:
* Pull the handle to dispense beans  
** Press the Stop button.
** Pull the handle to dispense beans into hopper immediately after the beans stop moving. (Leaving them sit still too long is a fire risk.)
** Give the beans a sideways shake in the hopper and let the air vents under the hopper cool the beans.
* Bag the beans
* Bag the beans
* Turn off Heat and Power switches
* Turn off Heat and Power switches
* Turn off exhaust fan
* Turn off exhaust fan
* Return hopper, funnel, and supplies
 
 
If you are in a hurry and don't want to wait for the machine to cool the beans down:
 
*Wait for bean temp to drop below 370 F, at which point yellow Reset lamp lights.
*Press the Stop button.
*Pull the handle to dispense beans into hopper immediately after the beans stop moving. (Leaving them sit still too long is a fire risk.)
*Give the beans a sideways shake in the hopper and let the air vents under the hopper cool the beans.


== Safety ==
== Safety ==
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|David Earl
|David Earl
|Theo Tetzlaff
|Theo Tetzlaff
Riley Pierce (refresher 9/8/23)
|Riley Pierce (refresher 9/8/23)
|4/16/23
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|Jordan Kessel
|Jordan Kessel
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|1/10/24
|1/10/24
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|Nick Hawley
Nick Hawley
|Riley Pierce
Riley Pierce
|7/29/24
7/29/24
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|Eric Brodersen
Eric Brodersen
|Riley Pierce
7/29/24
|7/29/24
 
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|Joshua Woodard
 
|Riley Pierce
 
|7/29/24
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|Cameron Petti
|Riley Pierce
|7/29/24
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|Eric Parsons
|Riley Pierce
|7/29/24
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|Books
|Riley Pierce
|10/17/24
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|Joe Somers
|Riley Pierce
|10/17/24
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|Caleb Schemmer
|Riley Pierce
|10/17/24
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|Eric Schoonhoven
|Riley Pierce
|1/5/25
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|Benjamin Klosky
|Riley Pierce
|1/5/25
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|Kevin wolff
|Riley Pierce
|1/28/25
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|Breezy Fasano
|Riley Pierce
|1/28/25
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|Janais Peace
|Riley Pierce
|1/28/25
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|Ren Blanding
|Riley Pierce
|1/28/25
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|Carlos Aranibar
|Riley Pierce
|1/28/25
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|Cameron Murphy
|Riley Pierce
|5/13/25
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|Moid Ali
|Riley Pierce
|5/13/25
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|Adam Henderson
|Riley Pierce
|5/13/25
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|David Carlson
|Riley Pierce
|5/13/25
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|Lucas Nelson
|Riley Pierce
|5/13/25
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|Daf Miller
|Riley Pierce
|9/28/25
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|Jack Van Boom
|Riley Pierce
|9/28/25
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|Jack Galbraith
|Riley Pierce
|9/28/25
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|Wren Parker
|Riley Pierce
|9/28/25
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|Mickey Price
|Riley Pierce
|11/10/25
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|Knute Martell
|Riley Pierce
|11/10/25
|}
|}


== Green Coffee Bean Suppliers ==
== Green Coffee Bean Suppliers ==
* Sahar International Supermarket -  Albany Park (2 miles North of PS1)  [https://maps.app.goo.gl/C2GzQn4xJR5A48VV7 4851 N Kedzie Ave, Chicago, IL 60625] - http://saharbrand.com/ 
* [https://javamaster.com/collections/coffee JavaMaster] - Sells in 3.5, 10, and 40 lbs quantities.
* [https://javamaster.com/collections/coffee JavaMaster] - Sells in 3.5, 10, and 40 lbs quantities.
* [https://www.sweetmarias.com/ Sweet Maria’s] - Sells in 1, 2, 5, 10, and 20 lbs quantities.
* [https://www.sweetmarias.com/ Sweet Maria’s] - Sells in 1, 2, 5, 10, and 20 lbs quantities.
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|Clean two exhaust thermocouples
|Clean two exhaust thermocouples
|10/17/24
|Riley
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|12/30/23
|12/30/23
|Ron and Riley
|Ron and Riley
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The roaster uses a Watlow PID controller (on the left) to control air temperature. It outputs a process value (4-20 mA), which an Avatar Instruments power controller uses to change the power to the heater via SCR phase dimming. The Avatar supports 240 V but the heater itself only can handle 208 V. This machine was designed to operate on 208 V but JavaMaster confirms it can operate on 240 V with an adjustment. Originally, JavaMaster suggested we limit the PID to 70% max output power. But that resulted in unexplained oscillations in temperature typically +/- 30 F. The Avatar includes an optional feature to limit output voltage via the V-LIM trim pot. This was adjusted so 100% on the PID corresponds to 208 V as measured by a true RMS voltmeter. If the machine is ever operated at 208 V again, it will require re-adjustment of this trim pot.
The roaster uses a Watlow PID controller (on the left) to control air temperature. It outputs a process value (4-20 mA), which an Avatar Instruments power controller uses to change the power to the heater via SCR phase dimming. The Avatar supports 240 V but the heater itself only can handle 208 V. This machine was designed to operate on 208 V but JavaMaster confirms it can operate on 240 V with an adjustment. Originally, JavaMaster suggested we limit the PID to 70% max output power. But that resulted in unexplained oscillations in temperature typically +/- 30 F. The Avatar includes an optional feature to limit output voltage via the V-LIM trim pot. This was adjusted so 100% on the PID corresponds to 208 V as measured by a true RMS voltmeter. If the machine is ever operated at 208 V again, it will require re-adjustment of this trim pot.
It seems the main fuse has fallen out of the fuse block in the past. We are looking for a better way to secure it.
If a roast is stopped before cooldown completes, it is possible that the PLC will get confused about roast state, and the next roast will not shut itself down. If a roast is ever aborted before cooldown, SHUT DOWN THE MACHINE before powering up and running another roast.


[[Category:Loaned Equipment]]
[[Category:Loaned Equipment]]
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